Why is detecting Earth-sized planets much more difficult than finding Jupiter-sized planets around other stars?
What will be an ideal response?
Jupiter is much more massive, so its gravity will produce enough pull on its star to create observed Doppler shifts. Also, Jupiter is much larger, so if it were to transit the disk of its star, the drop in starlight would be easier to detect.
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An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
A. 35 m/s B. 25 m/s C. 30 m/s D. 21 m/s E. 17 m/s
The drive chain in a bicycle is applying a torque of 0.850 Nm to the wheel of the bicycle. Treat the wheel as a hoop with a mass of 0.750 kg and a radius of 33.0 cm. What is the angular acceleration of the wheel?
A) 10.4 rad/s2 B) 20.8 rad/s2 C) 5.20 rad/s2 D) 3.43 rad/s2 E) 1.06 rad/s2
You have a choice between two lenses of focal lengths fa and fb = 2 fa to use as objective lens in building a refracting telescope. If the magnification you obtain using lens A is Ma, what will be the magnification when using lens B?
A) Mb = 2 Ma B) Mb = 4 Ma C) Mb = 8 Ma D) Mb = Ma /4 E) Mb = Ma /2
Two thin-walled concentric conducting spheres of radii 5.0 cm and 10 cm have a potential difference of 100 V between them. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
(a) What is the capacitance of this combination? (b) What is the charge carried by each sphere?